commit 62fe03d1dd629a98c6da86cabb2a98b85e89d516
Author: Lucas Stach <l.stach@pengutronix.de>
Date:   Wed Mar 5 14:25:51 2014 +0100

    PCI: designware: use new OF interrupt mapping when possible
    
    This is the recommended method of doing the IRQ
    mapping. For old devicetrees we fall back to the
    previous practice.
    
    Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
    Acked-by: Arnd Bergmann <arnd@arndb.de>
    Acked-by: Jingoo Han <jg1.han@samsung.com>
    Reviewed-by: Marek Vasut <marex@denx.de>

--- a/drivers/pci/host/pcie-designware.c
+++ b/drivers/pci/host/pcie-designware.c
@@ -17,6 +17,7 @@
 #include <linux/module.h>
 #include <linux/msi.h>
 #include <linux/of_address.h>
+#include <linux/of_pci.h>
 #include <linux/pci.h>
 #include <linux/pci_regs.h>
 #include <linux/types.h>
@@ -492,7 +493,7 @@ int __init dw_pcie_host_init(struct pcie
 	dw_pci.nr_controllers = 1;
 	dw_pci.private_data = (void **)&pp;
 
-	pci_common_init(&dw_pci);
+	pci_common_init_dev(pp->dev, &dw_pci);
 	pci_assign_unassigned_resources();
 #ifdef CONFIG_PCI_DOMAINS
 	dw_pci.domain++;
@@ -725,7 +726,7 @@ static struct pci_bus *dw_pcie_scan_bus(
 
 	if (pp) {
 		pp->root_bus_nr = sys->busnr;
-		bus = pci_scan_root_bus(NULL, sys->busnr, &dw_pcie_ops,
+		bus = pci_scan_root_bus(pp->dev, sys->busnr, &dw_pcie_ops,
 					sys, &sys->resources);
 	} else {
 		bus = NULL;
@@ -738,8 +739,13 @@ static struct pci_bus *dw_pcie_scan_bus(
 static int dw_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 {
 	struct pcie_port *pp = sys_to_pcie(dev->bus->sysdata);
+	int irq;
 
-	return pp->irq;
+	irq = of_irq_parse_and_map_pci(dev, slot, pin);
+	if (!irq)
+		irq = pp->irq;
+
+	return irq;
 }
 
 static void dw_pcie_add_bus(struct pci_bus *bus)